Thank you Net Galley and the publisher for providing an e-arc for review.
This book was set up for success... the Scandinavian setting, the mostly empty sanatorium with a spooky background, a bunch of characters that were all morally grey in their own ways. Twists that you felt, but didn't see coming. The dual time line in this was really effective in this too. I liked that the chapters were clearly labeled with character names and year. Honestly, struggling to criticise this book at all... kind of annoying really. There were a couple of short "lulls" in the story that dropped the rating for me to a 4 star but would recommend this to anyone who enjoys a mystery that edges into thriller territory.